I cannot say without viewing them. If you would like to send me a 'hub' through the messaging service, I would be pleased to take a look and give you some constructive advice.
This is entirely up to you.
If you revise your hubs,( one at a time), add more content, photos, polls etc then try publishing again. All I can advise is that you keep working on them until you find the right template.
You might also look through the tutorials and try to learn what you have omitted within your writing and presentation of your hubs.